Wait. You have a firestick which uses an HDMI plug to go into your TV. But your TV doesn't have an HDMI port, but a DVI port? So you bought an HDMI to DVI adapter to fit the firestick into your TV? DVI doesn't carry audio. And I don't think the firestick has an audio out. What you need is a TV that has HDMI on the back. Or if such a thing is made, an HDMI to DVI adapter that pulls the audio out of the HDMI and sends it to an normal audio out plug. Either optical or some other normal output. DVI doesn't carry audio so it's not going to work.